Full stack developer Jobs in Markham, ON

The Full Stack Engineer is responsible for front-end development and back-end interconnection of solutions that support AI-powered applications and integrations across GEI. This role builds user-facing and backend components for AI-enabled solutions, including custom applications and Copilot extensibility, ensuring seamless integration, performance, and scalability.

The Full Stack Engineer plays a hands-on delivery role in active AI Solutions Factory use cases by developing and maintaining application components, integrating AI services, and supporting secure, reliable deployment of AI-enabled applications within GEI’s technology environment.

• Develop and maintain secure front-end and back-end application components.
• Build user-facing web interfaces using React or similar frameworks and backend services using .NET or Node.
• Ensure seamless integration of AI solutions into applications and workflows.
• Integrate Microsoft Graph APIs and related enterprise services.
• Implement authentication and authorization using Entra ID, OAuth, and role-based access controls.
• Optimize application performance, reliability, scalability, and observability.
• Support AI-powered applications and integrations that enable Copilot extensibility and custom solutions.

Minimum Qualifications

We are GEI.

Some of the world’s most pressing problems – from climate change to sustainable development, to critical infrastructure and the future of our energy supply – need our brightest and diverse minds working together to create safer, more resilient communities for tomorrow.

We are technical experts, collaborators, and entrepreneurs who draw from diverse backgrounds to solve our clients’ most complex challenges.

With several offices across North America, we offer a range of engineering, science, and technical consulting services. Our range of expertise, project types, and culture make us the choice for top talent in the AEC industry. See all our office locations here

Employee-owned. Employee-focused.

As an employee-owned company, our employees support our flat leadership structure, have a say in how our business operates and benefit from our financial success. We are committed to employee growth with career development opportunities, competitive total rewards, a well‑being program, flexible work arrangements and more. Our company culture is driven by our 4 Cs – we are Client‑Centered, Curious, Collaborative, and Community Minded – which support our focus on sustainability, safety, diversity, equity and inclusion. Get to know us better by visiting GEI’s career sitehere .

GEI’s Total Rewards Package Includes

PHYSICAL REQUIREMENTS

Functional Demands : Sedentary, Light, Medium, Other.

Activity Level Throughout Workday : Occasional (0‑35% of day), Frequent (33‑66% of day), (67‑100% of day) Not Applicable. Physical Activity Requirements : Standing, Walking, Climbing, Lifting (floor to waist level), Lifting (waist level and above), Carrying objects, Push / pull, Twisting, Reaching forward, Reaching overhead. Keyboard use / repetitive motion : x. Taste or smell : x. Talk or hear : x.

Accurate 20 / 40, Very Accurate 20 / 20, Not Applicable near vision : x, far vision : x. Sensory Requirements : Minimal, Moderate, Accurate, Not Applicable depth perception : x, hearing : x. Reasonably Anticipated, Not Anticipated. Chemical, Extreme temperatures, Radiation, Uneven surfaces or elevations, Dust / particulate matter.

Other work hours. GEI is an AA / equal opportunity employer, including disabled and veterans.

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